| Late Cretaceous-Cenozoic Exhumation History of the Lüliang Mountains, North China Craton: Constraint from Fission-track Thermochronology |
| |
| 作者姓名： | LI Xiaoming and SONG Yougui |
| |
| 作者单位： | LI Xiaoming(Key Laboratory of Marginal Sea Geology,Guangzhou Institute of Geochemistry,the Chinese Academy of Sciences,Guangzhou 510640,China);SONG Yougui(State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,the Chinese Academy of Sciences,Xi' an 710075,China) |
| |
| 基金项目： | This work is financially supported by the State Key Laboratory of Loess and Quaternary Geology (Grant No. SKLLQG0507), National Natural Science Foundation of China (Grant Nos. 40572124 and 40772116), and Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (Grant No. 050713). This is contribution No. IS-1157 from GIGCAS. |
| |
| 摘 要： | The Lüliang Mountains, located in the North China Craton, is a relatively stable block, but it has experienced uplift and denudation since the late Mesozoic. We hence aim to explore its time and rate of the exhumation by the fission-track method. The results show that, no matter what type rocks are, the pooled ages of zircon and apatite fission-track range from 60.0 to 93.7 Ma and 28.6 to 43.3 Ma, respectively; all of the apatite fission-track length distributions are unimodal and yield a mean length of ~13?μm; and the thermal history modeling results based on apatite fission-track data indicate that the time-temperature paths exhibit similar patterns and the cooling has been accelerated for each sample since the Pliocene (c.5 Ma). Therefore, we can conclude that a successive cooling, probably involving two slow (during c.75-35 Ma and 35-5 Ma) and one rapid (during c.5 Ma-0 Ma) cooling, has occurred through the exhumation of the Lüliang Mountains since the late Cretaceous. The maximum exhumation is more than 5 km under a steady-state geothermal gradient of 35°C/km. Combined with the tectonic setting, this exhumation may be the resultant effect from the surrounding plate interactions, and it has been accelerated since c.5 Ma predominantly due to the India-Eurasia collision.
|
| 关 键 词： | 裂变径迹法 克拉通 折返 晚白垩纪 中国 磷灰石裂变径迹 新生代 热年代 |
| 收稿时间： | 2008/8/27 0:00:00 |
| 修稿时间： | 2009/2/25 0:00:00 |
Late Cretaceous-Cenozoic Exhumation History of the Lüliang Mountains,North China Craton: Constraint from Fission-track Thermochronology |
| |
| Authors: | LI Xiaoming SONG Yougui |
| |
| Institution: | 1. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, the Chinese Academy of Sciences, Guangzhou 510640, China;2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, the Chinese Academy of Sciences, Xi'an 710075, China |
| |
| Abstract: | The Lüliang Mountains, located in the North China Craton, is a relatively stable block, but it has experienced uplift and denudation since the late Mesozoic. We hence aim to explore its time and rate of the exhumation by the fission‐track method. The results show that, no matter what type rocks are, the pooled ages of zircon and apatite fission‐track range from 60.0 to 93.7 Ma and 28.6 to 43.3 Ma, respectively; all of the apatite fission‐track length distributions are unimodal and yield a mean length of ～13 μm; and the thermal history modeling results based on apatite fission‐track data indicate that the time‐temperature paths exhibit similar patterns and the cooling has been accelerated for each sample since the Pliocene (c.5 Ma). Therefore, we can conclude that a successive cooling, probably involving two slow (during c.75–35 Ma and 35–5 Ma) and one rapid (during c.5 Ma‐0 Ma) cooling, has occurred through the exhumation of the Lüliang Mountains since the late Cretaceous. The maximum exhumation is more than 5 km under a steady‐state geothermal gradient of 35°C/km. Combined with the tectonic setting, this exhumation may be the resultant effect from the surrounding plate interactions, and it has been accelerated since c.5 Ma predominantly due to the India‐Eurasia collision. |
| |
| Keywords: | fission-track exhumation Luliang Mountains late Cretaceous-Cenozoic geodynamics |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《Acta Geologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Geologica Sinica》下载免费的PDF全文 |
|
